An investigation was made into the physical, chemical and biological
conditions of the Elsburgspruit to establish the extent and quality of
pollution over a period of two and a half years from January 1987 June
1989. ...

Tilapia sparrmanii (Smith) was exposed to sub-lethal doses
of chromium, manganese, zinc and iron for 96 hours at an
acidic pH (5), a physiological pH (7,4) and an alkaline pH
(9), as well as a prolonged exposure (2 - 4 ...

The extent of economic damage caused to the cotton variety Acala 1517/70 by the feeding activities of Tetranychus cinnabarinus (Boisduval) has been studies at the Loskop Research Station, situated in the Transvaal Middleveld. ...

At present large scale extensive cropping of fish populations
of impoundments is being undertaken by the agricultural departments
of the government of the Republic of Venda and selfgoverning
states of Lebowa and Gazankulu. ...

The development of the chondrocranium, including the procartilaginous as well as some mesenchymatous developmental stages, was described in the chinese grass carp, ctenopharyngodon idella (Val.). Fourteen developmental ...

The spermatogenesis of two freshwater species from South Africa, Barbus
marequensis and B. polylepis, and three fresh water species from Israel, B. canis,
B. longiceps and Capoeta damascina, was studied.
A histological ...

An investigation was made into the water chemistry, bacteriology and
macroinvertebrate fauna of the Elsburg Spruit and its major tributaries
within the municipal boundaries of the City of Germiston. From the
results ...